Sinch Scheduled Maintenance - MMS - United States - AT&T

Scheduled for Jul 21, 04:00 - 06:00 UTC

Scheduled

Dear Client,

To improve the performance and reliability of our MMS platform, Sinch has scheduled maintenance affecting AT&T MMS connectivity. Please find the maintenance details below.

Maintenance Start time: 2026-07-21 04:00 UTC
Maintenance End time: 2026-07-21 06:00 UTC

Impact: During the maintenance window, customers may experience a loss of MMS delivery receipts. In addition, MMS MT traffic destined for AT&T devices may be delayed or fail.

We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly.

Please contact support@sinch.com should you require further information or assistance.

Posted Jul 02, 2026 - 18:32 UTC

This scheduled maintenance affects: Messaging APIs (MMS - US).